[ZODB-Dev] B-Tree API

[gfe@comit.ch]

Dear all,

we have converted some PersistentMappings in our ZODBs to OOBTrees. Now w=
e
are looking for solutions to the following problem:

We frequently use sort() on keys() returned by PersistentMapping. The
OOBTreeItems object returned by keys() on OOBTree doesn't provide a sort(=
)
method, as it is already sorted.

I would like to provide a dummy sort method, but I can neither inherit fr=
om
OOBTree (del fails, the __delitem__ method isn't inherited) nor easily
delegate to it (the special methods such as __delitem__ are not exposed).
Delegation would also involve an additional object and hence overhead. I
would need to return a list over OOBTreeItems, depriving the light-weight
iteration capability of OOBTreeItems.

Any ideas? Ideally, I think a do-nothing sort() method should be provided=
 to
achieve compatiblity with dictionaries and PersistentMappings.

Thank you and best regards,
Martin Gfeller

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